1. Low alloy high strength structural steel Q235B and High Frequency Welded Light Gauge H sections 2. ... contruction 1.standardGB/T 1591, GB/T700, ASTM, EN, DIN2. Steel gradeST37, A36, SS400, ST52, SM490, SM5703. Length6METER, 9 METERS, ... all kinds of architecture and engineering structure, such as the beam, Bridges, transmission tower, lifting transportation machinery, the ships, the industrial ...